In response to questions from fans, ZUN revealed some hints about her such as "Ordinary fairies are weaker than humans. Greater fairies are mightier than other fairies."[Ref. Needed] Cirno is said to be a very special exception in Phantasmagoria of Flower View, but according to this, "Greater Fairy" seems to be a generic term for some mighty fairies, although it's usually regarded as a personal name. She's said to be one of the normal-enemy class (not boss-class) characters.

Daiyousei wasn't given an official name at the time Embodiment of Scarlet Devil was released. ZUN confirmed soon after that she didn't have any official name, though he had done rough sketches for face graphics and initially planned for her, as well as Koakuma, to have their own spell cards.[1] Fans nicknamed her Daiyousei (大妖精, lit. "Big Fairy" or "Greater Fairy"). ZUN later used this nickname in an interview, although he probably used it as a general term for all stronger-than-normal fairies, so the name Daiyousei is still not really official as it's a semi-official name.

The data files for Fairy Wars reveals that the file name for her sprites is called "enemy_bf.anm", furthering her identification. "bf" is likely an abbreviation for "Big Fairy".

The design of Daiyousei appears to show that she has short green hair with a yellow ribbon. She wears a blue dress with white trim and sleeves and also has golden wings. The sprite in Fairy Wars shows that she was holding a bouquet of flowers.

Her appearance in Fairy Wars' Extra stage with Lily White marks the second ever appearance as a double midboss in the Touhou Project, where as the first time shown as a double midboss was the Two Red Dots, which are two strange creatures.

Daiyousei is one of the few characters who doesn't appear in Hopeless Masquerade as a background character. The reason is unknown.